Tachometer



Aug. 23, 1927.l

E'. BLUM TAGHQMETER Filed Feb. a.' 1920 ll lll Illlllllmm lllll Illl llllll Patented Aug. 23, 1927.

UNITED STATES PATFl-:NTy OFFICE.

EUGEN BLUM, OF VALLEY STREAM, NEW YORKNA'SSIGNOB, BY MESNE ASSIGNMENTS, TO AMERICAN SCHAEFFER A@c BUDENBERG' CORPORATION, OF BROOKLYN, NEW '.YORK, A CORPORATION OF NEW "YORK,v

TAGHOMETER. l

Application filed February 3, 192,0. Serial No. 356,604.

Among the principal objects whichA the present invention j hasl inview are: to increase the range of operation of the apparatus; to prov'ide"v a system for thoroughly lubricating the moving parts ofthe apparatusg'to condenselthe size of the apparatus; and to simplify the` construction and arrangement of the apparatus .Dra/wings.

Figure lis a detailed view on enlarged scale showing schematically, the arrangement of the transmission geary train and lparts associated therewith. f

lFigureV 2 is a cross section of' the cam plates for shifting the' gears forming said train, section being' taken as" on the lino 2 2 in Fig. 1.

' Z)e`. om'pz1oa.v

Referring to the drawings, the ltachometer has a spindlell, which in yserv`ice,l1als ahead of any suitable type, for engaging a rotary shaft, or other member, at thecenter thereof. Thes'pindle 11 carries gear'wheels 16y and 17 mountedy xedly on a sleeve 70. The sleeverOis pinned tothe shaft 14of the spindle 11. The sleeve 20 has a groove Vyoke collar 21. 'The sleeve 420 isslidably mounted on the free running shaft 22. A Y

spline on the sleeve 2O enters the lgroove 23 in the shaft 23 toinsurethe rotation of the shaft with the sleeve and gears mounted ythereon when driven by the spindle 11, and

the gear wheels thereon. v

It will be noted that the gear wheels 18 and 19 correspond in ratio with the gear wheels 16 and 17 and also that the wheels 18 and 19 are so spaced with relation to each other that when the one of said gear wheels is engaged with its corresponding gear wheel onthe spindle 11, theV other is disengaged. As the ratios of transmission between the gear wheels 16 and 18 and 17 and 19 respectively vary,'the ratio of transmission between the spindle '11 and shaft 22 is varied correspondingly. f

The purpose in transmitting the rotation throughthe various gears and intermediary shafts herein described is to vary the relative rotation of the spindle 11 and the governor shaft 24 or shaft whereonv is mounted the governor ring 25.

The ring 25 is normally held 0n the shaft 24 by 4pivot bearings *26,l upon which the said ring swings against spring tension, the

function whereof is to normally hold the ring'25 in the inclined position shown in the drawings. l

l As seen best inl `Fig. 2 of the drawings, the sl1aft22has" mountedy thereon, two movable gearsets, the one embodying the gear wheels 18 and 19, andthe other embodyingl gear wheels'v 38, 39and 40. The first mentioned gear set is fixedly mounted on the sleeve 20 and has a grooved yoke collar 21. The second mentionedgear set is similarly mounted on a sliding sleeve whichhas a yoke collar41.' A ,y The collars 21 and 41 are engaged by yokes 42 and 43.1 The said yokes are at the endfof arms 44 and'45.,r The arms44 and 45 arefoperated bythe cam plates 46 and d lwheels 54, 55, 56.. The geanfwheels'54, 55

and56 when operatively engaged mesh with '47. The caml'plates 46 and 47, and the positioning plate 48 are rigidly attached on` 'the' operating shaft 49. l

thel gear wheels 40,39 and 38, respectively.l

VIt willgalso be observed that the gear set .in its relation to the ring 25 has an established maximum speed and a minimum speed, that is to say, the maximum speed that which disposes the ring 25 in perpendicular relation to the said shaft 24 orV in engaged relation to the stop 33. The minimum speed is that at which the ring 25 begins to move toward the perpendicular rela- Y A tion to the shaft 24.V

'By reference to Fig. 1 of the drawings it will be seen that when the mechanism is turned clockwise, or in the direction of the embodying4 the wheels 40, 39 and 38 isl ararrow a, shown in said figure,"t'he cams '46 and VY47 are rotated with lthe immediate result that the arm 45, engaging the sleeve 20,l

is heldstationary, 4while the 'cam VAplate. is

lifted with the gear set 'enga-ged thereby.y rlhis retains the wheel 18 in engagement' with the wheel 16, while the wheel 39 is moved to engage the wheel 55. By the same movement the wheel 88 is carried froln en- "f gagement with the wheel A56. 1t is evi'den't that the ratio of transmission from the spindle 11 through 'the wheel 3,9 'to 'the *wheel '55 vis materially reduced for the sha-t 24.

` It' a further 'reduction is desired, the

mechanismI is 'moved in the direction indi- V gear set yconnected therewith until'the wheel 18 is disengaged from the wheel 16, and the wheel r19 has engaged 'the wheel'l. i

'Vith this 'disposition of the gears, the

transmission is from the spindlel 11 through the wheels 17 to 1'9; 38 to 56; 52'to `51`a`nd the shaft'24. 'A p, jfl' It will' 'now b'e foun'dthat 'the redu'etion obtained in the transmissioniis ltwice 4the 'reduction obtained in theiniti'al position. 1f a `further reduetion is required, 'the move- 'in'ent 'of the diskB 4is continue-d in 'the Vdireotion indicated by the arrow"?)".

The cani 4'6 now lifts the plate 44 and gear sets carried thereby, while the eam 47 holds the plate 45 inert. This movement 'of the gear set 'having the wheels 38,' 39 and 4'0 results in the wheel 38 passing out of engagement with the'wheel 56, 'while'fthe wheel 39 passes 4intoYfengage-ment -with the "Wheel 55.

The transmission with the gears in this position --is from the spindle `'i1-l 'through Ithe the wheel 55, the wheelj 'Cto cthewhe'el 51, and the shaft 24.

llt -a further reduction is required, the mechanism is further rotated. During this -i'ilovementthe cam 417 holds the plate 45 and wheels 18 and V19 associated therewith, statinar'y, while the earn '46 *further lifts "the plate 44'a1`1d'the wheels 38,39 40 associated vtherewith u'n't-il the wheel 39 passes out 'of engagement Awith the Wheel 55,"and the `wheel N 'passes 'into engagement with the wheel '54.A In'this position the transmisvsion will 'be itound tol be 'from the Aspindle 11 through the gear wheels 17 'to' 19, v4'0 'to 54, 52 to 51 and the-shaft 124. The reduction over ythe previous arrangement is evident.

"l elaim v y "In 'a'taehometer, a driving shaft, a driven shaft, a 'free running shaft disposed between said shafts, variable Atransr'nissio'n members disposed on 'said free runnin'ggshaft for longitudinal movement thereon relative 'to the Component members yfor 'varying 'the rate of transmission between the driving and driven shafts, afpair of arms .disposed in substantially parallel spaced relation and engaged each 'at one vvendwith eertain v'of 'said transmission l'members 'for limparting move'- ment thereof fon said -internediatefshaft upon movement of said arms, a p'lurali'ty'ot of s'ai'd arms; f Y

" EUGEN BLUM. 

